Answer :

(i)



=


= 100


(ii)


(178)2 – (22)2


= (178 + 22) (178 – 22)


= 200 × 156


= 31200


(iii)



=


= 300


(iv)


(1.73) – (0.27)


= (1.73 + 0.27) (1.73 – 0.27)


= 2 (1.46)


= 2.92


(v)



=


= 100


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